Carlson's TSS Turkey Choke Tubes are specifically optimized for Federal Premium Heavyweight TSS Turkey Loads, offering excellent performance with these shells. However, they also work exceptionally well with other manufacturers' turkey ammunition, especially with smaller shot sizes (7-9). Federal Premium's Heavyweight TSS Turkey Load is known for its incredibly high pellet count in both 7 and 9 shot sizes and its ability to carry energy further makes it ideal for .410, 20-Gauge and 12-Gauge shotguns. Tungsten Super Shot (TSS) is 22% denser than heavyweight shot and 56% denser than traditional lead shot, allowing for the maximum number of pellets to be placed in a 10 inches circle at 40 yd. These Heavyweight TSS shells are equipped with the FliteControl Flex wad, which gives hunters the flexibility to use any choke tube they prefer for precise and effective shooting.